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Chordates
A large phylum of animals that includes all vertebrates as well as several closely related invertebrates, characterized by the presence of a notochord at some stage of their development.
Monotremes
Egg-laying mammals, such as the platypus and echidna, representing a unique branch of the mammalian tree.
Parthenogenesis
The development of an unfertilized egg into an adult organism; common among honeybees, wasps, and certain other arthropods.
Lay Eggs
The act of depositing eggs by a female organism, as a means of reproduction.
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